This paper via the Kuznets theory, based on temporal sequences, representative environmental economic index, available environmental economic data, selects per capital GDP as economic index, three wastes (water, gas and solids) as environmental indexes to analyze the correlation between economic development and environmental pollution by means of SPSS130 in recent 2 decades. All indexes have been processed into standardization and simulated with SPSS. The economicenvironmental regression model and Kuznets curves together show an unstable EKC stage in Ningxia, denying a “first polluting and then meliorating” model. It is necessary to change the economic development model for a sustainable development of population, resources and environment.